Total length with tender40.5 m
5,063Ladybugs
14Condor wingspans
5.7 tenthsBoeing 747 lengths
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The largest steam locomotive ever built/Trains & Rail
The Union Pacific Big Boy is the largest steam locomotive ever built. Only 25 were manufactured between 1941 and 1944 to haul freight over the Wasatch Mountains. Each one is an absolute unit of riveted steel and controlled explosions. Big Boy No. 4014 was restored to operation in 2019 and remains the world's largest operating steam locomotive, delighting railfans and terrifying anyone standing too close to the tracks.
Loaded weight
About 6,300 horsepower
68-inch drivers
About 130 km/h
28 tons in the tender